linux-kernel - Re: [PATCH v2 2/2] perf test: Add support for setting objdump binary via perf config

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Date:   Fri, 10 Nov 2023 11:48:39 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     James Clark <james.clark@....com>
Cc:     linux-perf-users@...r.kernel.org, irogers@...gle.com,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, Yonghong Song <yhs@...com>,
        Fangrui Song <maskray@...gle.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Yang Jihong <yangjihong1@...wei.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH v2 2/2] perf test: Add support for setting objdump binary
 via perf config

Em Fri, Nov 10, 2023 at 01:57:11PM +0000, James Clark escreveu:
> 
> 
> On 09/11/2023 16:14, Arnaldo Carvalho de Melo wrote:
> > Em Thu, Nov 09, 2023 at 10:26:34AM +0000, James Clark escreveu:
> >>
> >>
> >> On 08/11/2023 20:53, Arnaldo Carvalho de Melo wrote:
> >>> Em Mon, Nov 06, 2023 at 03:10:49PM +0000, James Clark escreveu:
> >>>> Add a perf config variable that does the same thing as "perf test
> >>>> --objdump <x>".
> >>>>
> >>>> Also update the man page.
> >>>
> >>> That is ok, if one wants to change objdump just for testing, as a
> >>> followup improvement it may be interesting to allow that for the other
> >>> tools that have --objdump as well as to add this as a global option,
> >>> that affects all tools, no?
> >>
> >> For the tools they already all share annotate.objdump in the config. Do
> >> you mean that the tests could share the same config instead?
> > 
> > Probably.
> >  
> >> Maybe I could have used annotate.objdump for the tests, but it was used
> >> in a slightly different way, and I thought it would be easier for people
> >> to find if it started with "test."
> > 
> > Well, we can have both, with "test." overriding "annotate."?
> > 
> 
> Yeah overriding could work. IMO just one config value is probably enough
> though, so we could change it to annotate.objdump in the tests too, and
> remove the docs change. At least until someone has a usecase for a
> separate config value for the tests and then add the overriding behavior.
> 
> I don't have any strong feelings about either way.

We didn't publish any new version with test.objdump=, so please consider
submitting a patch for perf-tools-next making annotate.objdump= be used
in 'perf test' as well, update the documentation stating that this
applies to 'perf test' as well.

- Arnaldo
 
> > Anyway, I applied this patch locally, now trying to fix some unrelated
> > problem that is making 'perf test' fail so that I can push
> > perf-tools-next publicly.
> > 
> > - Arnaldo
> >  
> >>>
> >>> Anyway, applied both patches.
> >>>
> >>> - Arnaldo
> >>>  
> >>>> Signed-off-by: James Clark <james.clark@....com>
> >>>> ---
> >>>>  tools/perf/Documentation/perf-config.txt |  4 ++++
> >>>>  tools/perf/tests/builtin-test.c          | 12 ++++++++++++
> >>>>  2 files changed, 16 insertions(+)
> >>>>
> >>>> diff --git a/tools/perf/Documentation/perf-config.txt b/tools/perf/Documentation/perf-config.txt
> >>>> index 0b4e79dbd3f6..16398babd1ef 100644
> >>>> --- a/tools/perf/Documentation/perf-config.txt
> >>>> +++ b/tools/perf/Documentation/perf-config.txt
> >>>> @@ -722,6 +722,10 @@ session-<NAME>.*::
> >>>>  		Defines new record session for daemon. The value is record's
> >>>>  		command line without the 'record' keyword.
> >>>>  
> >>>> +test.*::
> >>>> +
> >>>> +	test.objdump::
> >>>> +		objdump binary to use for disassembly and annotations.
> >>>>  
> >>>>  SEE ALSO
> >>>>  --------
> >>>> diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
> >>>> index a8d17dd50588..113e92119e1d 100644
> >>>> --- a/tools/perf/tests/builtin-test.c
> >>>> +++ b/tools/perf/tests/builtin-test.c
> >>>> @@ -14,6 +14,7 @@
> >>>>  #include <sys/wait.h>
> >>>>  #include <sys/stat.h>
> >>>>  #include "builtin.h"
> >>>> +#include "config.h"
> >>>>  #include "hist.h"
> >>>>  #include "intlist.h"
> >>>>  #include "tests.h"
> >>>> @@ -514,6 +515,15 @@ static int run_workload(const char *work, int argc, const char **argv)
> >>>>  	return -1;
> >>>>  }
> >>>>  
> >>>> +static int perf_test__config(const char *var, const char *value,
> >>>> +			     void *data __maybe_unused)
> >>>> +{
> >>>> +	if (!strcmp(var, "test.objdump"))
> >>>> +		test_objdump_path = value;
> >>>> +
> >>>> +	return 0;
> >>>> +}
> >>>> +
> >>>>  int cmd_test(int argc, const char **argv)
> >>>>  {
> >>>>  	const char *test_usage[] = {
> >>>> @@ -541,6 +551,8 @@ int cmd_test(int argc, const char **argv)
> >>>>          if (ret < 0)
> >>>>                  return ret;
> >>>>  
> >>>> +	perf_config(perf_test__config, NULL);
> >>>> +
> >>>>  	/* Unbuffered output */
> >>>>  	setvbuf(stdout, NULL, _IONBF, 0);
> >>>>  
> >>>> -- 
> >>>> 2.34.1
> >>>>
> >>>
> > 
> 

-- 

- Arnaldo